From: "Dmitry V. Levin" <ldv@altlinux.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: akpm@linux-foundation.org,
Tatsiana Brouka <Tatsiana_Brouka@epam.com>,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Aliaksandr Patseyenak <Aliaksandr_Patseyenak1@epam.com>,
Andrey Vagin <avagin@openvz.org>
Subject: Re: [PATCH 1/2] pidmap(2)
Date: Thu, 7 Sep 2017 13:08:09 +0300 [thread overview]
Message-ID: <20170907100809.GD27490@altlinux.org> (raw)
In-Reply-To: <20170905190500.GA13746@avx2>
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On Tue, Sep 05, 2017 at 10:05:00PM +0300, Alexey Dobriyan wrote:
> From: Tatsiana Brouka <Tatsiana_Brouka@epam.com>
>
> Implement system call for bulk retrieveing of pids in binary form.
>
> Using /proc is slower than necessary: 3 syscalls + another 3 for each thread +
> converting with atoi().
>
> /proc may be not mounted especially in containers. Natural extension of
> hidepid=2 efforts is to not mount /proc at all.
>
> It could be used by programs like ps, top or CRIU. Speed increase will
> become more drastic once combined with bulk retrieval of process statistics.
What could give a noticeable performance gain in a less ridiculous way
is an interface like task_diag, see https://lkml.org/lkml/2016/4/11/924 .
--
ldv
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prev parent reply other threads:[~2017-09-07 10:08 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-05 19:05 [PATCH 1/2] pidmap(2) Alexey Dobriyan
2017-09-05 19:05 ` Alexey Dobriyan
2017-09-05 19:06 ` [PATCH 2/2] fdmap(2) Alexey Dobriyan
2017-09-05 19:06 ` Alexey Dobriyan
2017-09-05 22:53 ` [PATCH 1/2] pidmap(2) Andrew Morton
[not found] ` <20170905155320.a683a4853b21a3be32d8b529-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2017-09-05 23:02 ` Randy Dunlap
2017-09-05 23:02 ` Randy Dunlap
[not found] ` <d538b917-3e3e-827c-7ca0-5493961cf6f1-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-09-06 8:30 ` Thomas Gleixner
2017-09-06 8:30 ` Thomas Gleixner
2017-09-06 9:04 ` Alexey Dobriyan
2017-09-06 9:04 ` Alexey Dobriyan
[not found] ` <CACVxJT_vg7DnxSGmMtRT5aLCL=jutD94-yXaNOBwrJc-G+g_1w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-07 2:04 ` Andy Lutomirski
2017-09-07 2:04 ` Andy Lutomirski
[not found] ` <CALCETrUFnfncs9QdZ4LTeFemVTCx-27bu88M=3U=RKBT8Oykwg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-09-07 5:06 ` Djalal Harouni
2017-09-07 5:06 ` Djalal Harouni
2017-09-07 9:47 ` Alexey Dobriyan
2017-09-07 9:43 ` Alexey Dobriyan
2017-09-06 8:55 ` Alexey Dobriyan
2017-09-06 8:55 ` Alexey Dobriyan
2017-09-07 10:08 ` Dmitry V. Levin [this message]
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